{"instruction": "You are an expert in event argument extraction. Please extract event arguments and their roles from the input that conform to the schema definition, which already includes event trigger words. If an argument does not exist, return NAN or an empty dictionary. Please respond in the format of a JSON string.", "schema": [{"event_type": "adverse event", "arguments": ["Treatment.Drug", "Treatment.Duration", "Effect", "Combination.Drug", "Subject.Race", "Subject.Gender", "Subject", "Treatment", "Subject.Disorder", "Treatment.Disorder", "Treatment.Dosage", "Subject.Age", "Treatment.Time_elapsed", "Subject.Population"]}], "input": "The pro-arrhythmic effects of procainamide may be explained on the basis of both its vagolytic action on the atrioventricular node as well as by prolongation of refractoriness in the accessory pathway."}
{"adverse event": [{"Treatment.Drug": "procainamide", "Treatment.Duration": "NAN", "Effect": "pro-arrhythmic effects", "Combination.Drug": "NAN", "Subject.Race": "NAN", "Subject.Gender": "NAN", "Subject": "NAN", "Treatment": "procainamide", "Subject.Disorder": "NAN", "Treatment.Disorder": "NAN", "Treatment.Dosage": "NAN", "Subject.Age": "NAN", "Treatment.Time_elapsed": "NAN", "Subject.Population": "NAN"}]}